/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.web.client;

import com.cleangwt.user.client.PendingHandler;
import com.cleangwt.user.shared.Serializer;

/**
 * A {@link PendingCallback} to deserialize json response as type <code>T</code> for
 * {@link #onJsonDersieralized(Object)}.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public abstract class JsonCallback<T> extends PendingCallback {

  /**
   * Creates a json callback.
   */
  public JsonCallback() {
    super(null);
  }

  /**
   * Creates a json callback with the given pending handler.
   * 
   * @param pendingHandler the widget to be blocked
   */
  public JsonCallback(PendingHandler pendingHandler) {
    super(pendingHandler);
  }

  /**
   * Called when response to be deserialized to the result of type <code>T</code>.
   * 
   * @param result the result of type <code>T</code>
   */
  protected abstract void onJsonDersieralized(T result);

  @Override
  @SuppressWarnings("unchecked")
  protected final void onSuccess(String result) {
    onJsonDersieralized((T) Serializer.fromJson(result));
  }

}
